const formatDate = date => {
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()
    return [year, month, day].map(formatNumber).join('-')
}
const formatTime = date => {
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()
    return [hour, minute, second].map(formatNumber).join(':')
}

const numToTime=num=>{
    const h=parseInt(num/3600)||0
    const m=parseInt(num%3600/60)||0
    const s=parseInt(num%3600%60)||0
    return [m,s].map(formatNumber).join(':')
}
const formatNumber = n => {
    n = n.toString()
    return n[1] ? n : '0' + n
}
export {formatDate,formatTime,formatNumber,numToTime}